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ented Oct.. 19, 1880 E. T. STARR. Dental Plugge Pat KPETERS. PROTO-LHMGGRAPHER, WASHINGTON D c NITED STATES PATENT FFICE.

ELI T. STARR, OF PHILADELPHIA, PA., ASSIGNOR TO JAMES W. WHITE, J. CLARENCE WHITE, AND H. M. LEWIS, TRUSTEES, OF SAME PLACE.

DENTAL PLUGGER.

SPECIFICATION forming part of Letters Patent No..233,572, dated October 19, 1880,

Application led July 20, 1880.

To all whom t may concern:

Be it known that I, ELI T. STARR, of the city and countyf Philadelphia, in the State of Pennsylvania, have invented certain new and useful Improvements in Dental Plugging- Instruments, of which thefollowing is a speciiication.

My invention relates particularly to a plugging attachmentfor dental-engine hand-pieces,

1o whereby back and other fillings difcult(if not impossible) to reach with the ordinary mechanical pluggers may be impacted or condensed with ease and rapidity.

The subject-matter claimed will be particularly pointed out at the close of the specification.

In the accompanying drawings, which illustrate myimprovements as embodied in the best waynow known to me, Figure l is a top-plan 2 o View of the improved a ttachment with a portion of the barrel or sleeve that fits upon the handpiece broken off. Fig. 2 is alongitudinal central section through the attachment. Fig. 3 is a cross-section therethrough on the line 3 3 of Fig. 2; antLFig. 4 is a longitudinal central section through the tool-holder, showing a tool as inserted and secured therein.

The barrel, tube, or sleeve A has a large bore at its rear end, so as to permit it to be 3o slipped upon the end of a dental-engine handpiece casin g, (not necessary to be shown,) with the rotary spindle or shaft B inserted in the socket of the rotary chuck or tool-holder of the hand-piece, whereby said spindle may be rapidly rotated in its bearings in the barrel of the attachment when the engine is in motion. The rear end of said spindle Bis beveled or {iattened, and is provided with a transverse groove in order to adapt `it to the tool-holder and lock- 4o ingdeviccs of thehand-piece ofthe well-known S. S. White dental engine. The inner end of said spindle may, of course, be constructed in other ways, so as to lit the chuck of the particular hand-piece with which it is to be used. Said spindle B is fitted in two bearings, a a', of the attachment, so as to compel its smooth and steady rotation. The front bearing, a, is in a forked plate, O, secured to the barrel A, and forming part of the attachinent-casin g.

(Model.)

The arms c o of the forked plate extend forward, and in suitable bearings therein a toolholder, D, is fitted so as to be capable of reciprocation at right angles to or erosswise of the longitudinal axis of the revolving spindle B and of the longitudinal bore ofthe barrel or sleeve of the attachment, so that the attachment constitutes what I call a right-angleplugging attachment.

The tool-holder D is moved in one direction to impact the filling by a four-sided cam plate, E, secured upon the front end of the revolving spindle B, the corners cof which cam-plate form hammers, which successively strike upon the rounded face of alug or projection, d, on the tool-holder to impart a series of blows to said tool-holder in rapid succession. After each blow of the cam and forcing forward of the tool-holder by one of the camshoulders e the tool-holder is retracted against the sides of the cam-plate, so as to be in position to receive the next blow from the succeedingcam-shoulder, and this retraction is preferably performed by a platespring, F, secured at one end to the plate C, and at the other acting upon the upper end of the tool-holder, the neck of a button or knob, d', on which holder the spring encircles, as shown in Figs. 1,2, and 3. The force or stress of the spring is always exerted to throw or retract the tool-holder lug d toward the revolving cam-plate. For every revolution of said cam-plate, it will be understood,four successive and distinct hammer-like blows are delivered to the tool-holder, and by it communicated to the plugging point or tool G, inserted in the socket of the tool-holder, and held therein, iu this example, by screw-threads, as is usual. Y By screw-threading the slianks of the operating-tools they are readily inserted in and with drawn from the tool-holder, while securely held therein in operation.

The lug d of the tool-holder D, which receives the blows ofthe cam, is fitted in a suitable recess inthe lower arm, c', of the forked plate C, so that said lug is always in position to receive blows from the cam, as it keeps the tool-holder from turning axially in its bearings.

From the foregoing it will be perceived that I have produced a very simple and efficient an gle-plugge13 adapted for attachment. to dental-engine hand-pieces so as to be driven by the tool-holders or rotary chucks thereof', and that said pluggeris adapted to imgact or condense illings in teeth to which access would with difficulty be had by the ordinary straight mechanical pluggers.

I ain aware that angle-pluggers have been before suggested, and do not claim that broadly as ot' lny invention.

I am also aware that revolving cams to impart blows to the tool-holders of dental pluggers which are acted upon by returning springs are very old.

I claim as Inyinventionl. The combination, substantially as hereinbefore set forth, of the barrel of the attachment, the spindle mounted longitudinally therein, so as to be revolved, the tool-holder ittcd so as to be moved crosswise of the longitudinal axis ot said spindle, the lug ou said tool-holder, the cam upon said spindle to impart blows to said tool-holder through the medium of said lug, and the retracting-spring acting' upon said holder.

2. The combination, substantially as hereinbefore set forth, of the forked plate, the toolholder fitted therein so as to be moved in one direction to impact the tooth-iilling, and the plate-spring to retract the tool-holder after each bloW is delivered.

3. The combination, substantially as hereinbetore set forth, ot' the spindle, the cam-plate driven thereby, the tool-holder, the lug of said tool-holder to receive the blows of the cam and also prevent rotation ot said tool-holder, and the spring to retract said holder after each blow.

In testimony whereof I have hereunto subscribed my name.

ELI T. STARR.

Witnesses: Y

J A. B. WILLIAMS, S. E. CAMPBELL. 

